how did the collectors of the hadith judge during [the age of companions] whether the hadith they are collecting are authentic? [4]
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Answer:
Determining authenticity of hadith is enormously important in Islam because along with the Quran, the Sunnah of the Islamic prophet—his words, actions, and the silent approval—are considered divine revelation (wahy), and the record of them (i.e. hadith) provides the basis of Islamic law (Sharia). In addition, while the number of verses pertaining to law in the Quran is relatively few, hadith give direction on everything from details of religious obligations (such as Ghusl or Wudu, ablutions[3] for salat prayer), to the correct forms of salutations,[4] and the importance of benevolence to slaves.[5] Thus the "great bulk" of the rules of Islamic law are derived from hadith, rather than the Quran.[6][Note 2]
Because hadith were passed down orally and not compiled in written works until around the third century of Islam,[8] there is no ancient written documentation to examine. Thus, according to the classical science of hadith, there are three primary ways to determine the authenticity (sihha) of a hadith: by attempting to determine whether there are "other identical reports from other transmitters"; determining the reliability of the transmitters of the report; and "the continuity of the chain of transmission" of the hadith.[1]
Traditional hadith studies has been praised as "unrivaled, the ultimate in historical criticism",[9] and criticized as failing to filter out many hadith "which cannot possibly be authentic".[10]